The optical components of the NIRSpec wheel mechanisms

Ellenrieder, Marc M.; Weidlich, Kai; Nelles, B.; Ploss, B.; Bruynooghe, S.; Köhler, Jan; Plate, Maurice te

doi:10.1117/12.789727

Cited by 5 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optomechanical performances of the filters were demonstrated successfully at ambient and cryogenic temperatures. The component level optical qualification tests are close to completion with all the critical tests already finished [4]. The prism and grating mount breadboards are under completion.…”

Section: Implementation Statusmentioning

confidence: 98%

“…The filter coating development and breadboard level tests of the mounted filters have been completed [4]. The optomechanical performances of the filters were demonstrated successfully at ambient and cryogenic temperatures.…”

Section: Implementation Statusmentioning

confidence: 98%

“…Most of the filters are made from the delicate calcium fluoride (CaF 2 ) material as well. The free diameter of the filter components is about 70 mm [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument

Weidlich

Fischer

Ellenrieder

et al. 2008

Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

Self Cite

View full text Add to dashboard Cite

The Grating and Filter Wheel Mechanisms of the JWST NIRSpec instrument allow for reconfiguration of the spectrograph in space in a number of NIR sub-bands and spectral resolutions. Challenging requirements need to be met simultaneously including high launch loads, the large temperature shift to cryo-space, high position repeatability and minimum deformation of the mounted optics. The design concept of the NIRSpec wheel mechanisms is based on the ISOPHOT Filter Wheels but with significant enhancements to support much larger optics. A well-balanced set of design parameters was to be found and a considerable effort was spent to adjust the hardware within narrow tolerances.

show abstract

Section: Implementation Statusmentioning

confidence: 98%

Section: Implementation Statusmentioning

confidence: 98%

See 1 more Smart Citation

High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument

Weidlich

Fischer

Ellenrieder

et al. 2008

Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, wheel mechanisms are designed to meet various observation requirements and satisfy the demands of long service life, low driving power, high positioning accuracy, and withstanding serious vibration during launch, which are closely related to the performance of the support roller bearing [166]. For example, the filter wheel mechanism, MoS 2 /TiC, and gold coating-lubricated bearings were used in the JWST and Herschel telescope of the European Space Agency (ESA), respectively, in which the bearings should achieve lubrication below 30 K [7,[167][168][169][170]. In April 2022, the JWST successfully completed the preliminary adjustment, and the first photo was released in July.…”

Section: Solid-lubricated Roller Bearingmentioning

confidence: 99%

Progresses on cryo-tribology: lubrication mechanisms, detection methods and applications

Cui

Hongzhan

Zhao

et al. 2023

Int. J. Extrem. Manuf.

View full text Add to dashboard Cite

Tribology at cryogenic temperatures has attracted people’s attention since the 1950s with the acceleration of its applications on hi-tech equipment such as the cryogenic wind tunnel, liquid fuel rocket, space infrared telescope, superconducting device, planetary exploration, which requires solid lubrication for moving parts at low temperature down to 4 K in cryogenic liquid, gaseous or vacuum environments. Here the research progresses on cryo-tribology are reviewed. Tribological properties and mechanisms of solid lubricants listed as carbon material, molybdenum disulfide (MoS2), polymer and polymer-based composite, etc. with decreasing temperature are summarized. The friction coefficient was found to increase with decreasing temperature induced by thermally activated processes. The mechanism of transfer film formation should be noticed as a significant way to promote the tribological properties of the solid lubricant. On the other hand, applications of solid lubrication on moving parts under cryogenic conditions such as the spherical plain bearing, roller bearing are introduced. Tribological test technology of materials and bearings at cryogenic temperatures is summarized where the environmental control, motion and loading realization, as well as friction and wear measurement together at low-temperature environment result in the difficulties and challenges of the low-temperature tribotester. It is worth mentioning that novel technologies and tribotesters were developed for tribo-tests and tribological studies of solid lubricant, spherical plain bearing and roller bearing respectively by overcoming the limitation on cooling in vacuum, resolution of friction measurement, etc., and concentrating on in-situ observation of friction interface aiming to not only promote a deep understanding of friction and wear mechanism at low temperatures, but also give insights into performance of moving parts or components in cryogenic applications.

show abstract